Bump Java from 14 to 15 in CI (#1252)

* Bump Java from 14 to 15 in CI

Signed-off-by: Pavol Loffay <ploffay@redhat.com>

* Review comments

Signed-off-by: Pavol Loffay <ploffay@redhat.com>

* adjust comment

Signed-off-by: Pavol Loffay <ploffay@redhat.com>

* Bump jacoco to 0.8.6

Signed-off-by: Pavol Loffay <ploffay@redhat.com>

* maxJavaVersionForTests

Signed-off-by: Pavol Loffay <ploffay@redhat.com>

.github/workflows/build-play-smoke-dist.yaml

@@ -29,5 +29,5 @@ jobs:
         run: |
           ./gradlew jib -PtargetJDK=8 -Djib.httpTimeout=120000 -Djib.console=plain
           ./gradlew jib -PtargetJDK=11 -Djib.httpTimeout=120000 -Djib.console=plain
-          ./gradlew jib -PtargetJDK=14 -Djib.httpTimeout=120000 -Djib.console=plain
+          ./gradlew jib -PtargetJDK=15 -Djib.httpTimeout=120000 -Djib.console=plain
         working-directory: smoke-tests/play

.github/workflows/build-springboot-smoke-dist.yaml

@@ -29,5 +29,5 @@ jobs:
         run: |
           ./gradlew jib -PtargetJDK=8 -Djib.httpTimeout=120000 -Djib.console=plain --stacktrace
           ./gradlew jib -PtargetJDK=11 -Djib.httpTimeout=120000 -Djib.console=plain --stacktrace
-          ./gradlew jib -PtargetJDK=14 -Djib.httpTimeout=120000 -Djib.console=plain --stacktrace
+          ./gradlew jib -PtargetJDK=15 -Djib.httpTimeout=120000 -Djib.console=plain --stacktrace
         working-directory: smoke-tests/springboot

.github/workflows/nightly.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 11, 14]
+        java: [8, 11, 15]
       fail-fast: false
     steps:
       - uses: actions/checkout@v2

.github/workflows/pr.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 11, 14]
+        java: [8, 11, 15]
       fail-fast: false
     steps:
       - uses: actions/checkout@v2

docs/contributing/running-tests.md

@@ -2,10 +2,10 @@
 
 #### Java versions
 
-Open Telemetry Auto Instrumentation's minimal supported version is java 7.
+Open Telemetry Auto Instrumentation's minimal supported version is java 8.
 All jar files that we produce, unless noted otherwise, have bytecode
-compatible with java 7 runtime. In addition to that we test our code with all
-later java versions as well: from 8 to 14.
+compatible with java 8 runtime. Our test suite is executed against
+java 8, all LTS versions and the latest non-LTS version.
 
 Some libraries that we auto-instrument may have higher minimal requirements.
 In this case we compile and test corresponding auto-instrumentation with

gradle/jacoco.gradle

@@ -1,7 +1,7 @@
 apply plugin: "jacoco"
 
 jacoco {
-  toolVersion = "0.8.5"
+  toolVersion = "0.8.6"
 }
 
 jacocoTestReport {

instrumentation/akka-http-10.0/akka-http-10.0.gradle

@@ -2,6 +2,12 @@ apply from: "$rootDir/gradle/instrumentation.gradle"
 apply from: "$rootDir/gradle/test-with-scala.gradle"
 apply plugin: 'org.unbroken-dome.test-sets'
 
+ext {
+  // TODO remove once Scala/akka supports Java 15
+  // https://docs.scala-lang.org/overviews/jdk-compatibility/overview.html
+  maxJavaVersionForTests = JavaVersion.VERSION_14
+}
+
 testSets {
   version101Test {
     dirName = 'test'

smoke-tests/src/test/groovy/io/opentelemetry/smoketest/PlaySmokeTest.groovy

@@ -45,7 +45,7 @@ class PlaySmokeTest extends SmokeTest {
     stopTarget()
 
     where:
-    jdk << [8, 11, 14]
+    jdk << [8, 11, 15]
   }
 
 }

smoke-tests/src/test/groovy/io/opentelemetry/smoketest/SpringBootSmokeTest.groovy

@@ -63,6 +63,6 @@ class SpringBootSmokeTest extends SmokeTest {
     stopTarget()
 
     where:
-    jdk << [8, 11, 14]
+    jdk << [8, 11, 15]
   }
 }

smoke-tests/src/test/groovy/io/opentelemetry/smoketest/SpringBootWithSamplingSmokeTest.groovy

@@ -55,6 +55,6 @@ class SpringBootWithSamplingSmokeTest extends SmokeTest {
     stopTarget()
 
     where:
-    jdk << [8, 11, 14]
+    jdk << [8, 11, 15]
   }
 }